单项选择题

In the Middle West, frost may appear in_______________.

A．late spring
B．early spring
C．late summer
D．early autumn
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单项选择题
They began to sail around the world single-handed at _________ the same age, but their results were quite different.
A．approximately
B．appropriately
C．closely
D．similarly
单项选择题
The reason why I left before the meeting ended was ________________ I was bored by the lengthy speeches.
A．that
B．because
C．because that
D．for
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